| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package libcore.io; |
| |
| import java.io.File; |
| import java.io.FileDescriptor; |
| import java.io.IOException; |
| import java.io.RandomAccessFile; |
| import java.net.Socket; |
| import java.nio.charset.Charsets; |
| import static libcore.io.OsConstants.*; |
| |
| public final class IoUtils { |
| private IoUtils() { |
| } |
| |
| /** |
| * Calls close(2) on 'fd'. Also resets the internal int to -1. Does nothing if 'fd' is null |
| * or invalid. |
| */ |
| public static void close(FileDescriptor fd) throws IOException { |
| try { |
| if (fd != null && fd.valid()) { |
| Libcore.os.close(fd); |
| } |
| } catch (ErrnoException errnoException) { |
| throw errnoException.rethrowAsIOException(); |
| } |
| } |
| |
| /** |
| * Closes 'closeable', ignoring any checked exceptions. Does nothing if 'closeable' is null. |
| */ |
| public static void closeQuietly(AutoCloseable closeable) { |
| if (closeable != null) { |
| try { |
| closeable.close(); |
| } catch (RuntimeException rethrown) { |
| throw rethrown; |
| } catch (Exception ignored) { |
| } |
| } |
| } |
| |
| /** |
| * Closes 'fd', ignoring any exceptions. Does nothing if 'fd' is null or invalid. |
| */ |
| public static void closeQuietly(FileDescriptor fd) { |
| try { |
| IoUtils.close(fd); |
| } catch (IOException ignored) { |
| } |
| } |
| |
| /** |
| * Closes 'socket', ignoring any exceptions. Does nothing if 'socket' is null. |
| */ |
| public static void closeQuietly(Socket socket) { |
| if (socket != null) { |
| try { |
| socket.close(); |
| } catch (Exception ignored) { |
| } |
| } |
| } |
| |
| /** |
| * Sets 'fd' to be blocking or non-blocking, according to the state of 'blocking'. |
| */ |
| public static void setBlocking(FileDescriptor fd, boolean blocking) throws IOException { |
| try { |
| int flags = Libcore.os.fcntlVoid(fd, F_GETFL); |
| if (!blocking) { |
| flags |= O_NONBLOCK; |
| } else { |
| flags &= ~O_NONBLOCK; |
| } |
| Libcore.os.fcntlLong(fd, F_SETFL, flags); |
| } catch (ErrnoException errnoException) { |
| throw errnoException.rethrowAsIOException(); |
| } |
| } |
| |
| /** |
| * Returns the contents of 'path' as a byte array. |
| */ |
| public static byte[] readFileAsByteArray(String path) throws IOException { |
| return readFileAsBytes(path).toByteArray(); |
| } |
| |
| /** |
| * Returns the contents of 'path' as a string. The contents are assumed to be UTF-8. |
| */ |
| public static String readFileAsString(String path) throws IOException { |
| return readFileAsBytes(path).toString(Charsets.UTF_8); |
| } |
| |
| private static UnsafeByteSequence readFileAsBytes(String path) throws IOException { |
| RandomAccessFile f = null; |
| try { |
| f = new RandomAccessFile(path, "r"); |
| UnsafeByteSequence bytes = new UnsafeByteSequence((int) f.length()); |
| byte[] buffer = new byte[8192]; |
| while (true) { |
| int byteCount = f.read(buffer); |
| if (byteCount == -1) { |
| return bytes; |
| } |
| bytes.write(buffer, 0, byteCount); |
| } |
| } finally { |
| IoUtils.closeQuietly(f); |
| } |
| } |
| |
| /** |
| * Recursively delete everything in {@code dir}. |
| */ |
| // TODO: this should specify paths as Strings rather than as Files |
| public static void deleteContents(File dir) throws IOException { |
| File[] files = dir.listFiles(); |
| if (files == null) { |
| throw new IllegalArgumentException("not a directory: " + dir); |
| } |
| for (File file : files) { |
| if (file.isDirectory()) { |
| deleteContents(file); |
| } |
| if (!file.delete()) { |
| throw new IOException("failed to delete file: " + file); |
| } |
| } |
| } |
| } |